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step 2: ADP and Pi are released, the myosin head pivots and binds then changing into its low energy state. As a result it pulls the actin filament towards the M line.

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Step 3: After the ATP attaches to myosin, the link between myosin and actin weakens and the myosin detaches.

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Step 4: cocking of the myosin head as ATP hydrolyzed to ADP and Pi the myosin head returns to its prestroke high energy or cocked position.

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step 1: energized myosin head attaches to an actin myofilament then forming cross bridges.

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Step 3 and 4: Myosin binds to actin which forms cross bridges and the contraction begins.

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Step 2: Transmission of the action potential along the T tubules cause the adjacent sarcoplasmic reticulum (SR) to release Ca2+ which flows into the cytosol.

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Step 1:  The action potential moves down the sarcolemma (cell membrane) and then down the T tubules (protrusion of the sarcolemma that protrude deep into the muscle cell).

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Summarize steps of event 1 using the following words: Acetycholine, Calcium ions, action potential, axon terminal, sarcolemma, voltage-gated Na+ ion channels, voltage-gated K+ ion channels, depolarization, repolarization, Na+ ions and K+ ions.